13%
Fewer calories eaten when drinking 500ml before meals (2016 study)
24–30%
Metabolic boost from drinking 500ml of cold water for 90 minutes
2kg
Extra weight lost by the high-water group in a 12-week trial
Your weight loss hydration calculator.
STEP 01
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Weight loss hydration strategy.
Before meals
Drink 500ml exactly 30 minutes before each meal. Studies show this reduces caloric intake by an average of 13% at that meal.
Morning protocol
Start with 500ml before coffee or breakfast. This rehydrates your body, jumpstarts your metabolism, and reduces morning hunger.
Replace liquid calories
Each glass of soda you replace with water saves ~150 calories. Over a month, that is 4,500 calories — over 1 pound of fat.
Track your intake
Use our tracker below to log every glass. People who track their water intake drink 20% more on average than those who don't.
FAQ — water and weight loss.
Water aids weight loss through four mechanisms: (1) appetite suppression — drinking 500ml before meals reduces calorie intake by ~13%; (2) calorie replacement — water has zero calories vs. 150+ in sodas; (3) thermogenesis — cold water increases metabolic rate by 24–30% for 90 minutes; (4) exercise performance — staying hydrated lets you train harder. Use our water intake calculator for weight loss to get a goal that supports your caloric deficit.
Both work. Cold water causes a minor thermogenic effect (your body burns calories warming it to 37°C), but the difference is roughly 8 extra calories per 500ml — negligible compared to diet and exercise. Consistency and total daily volume matter far more than temperature. Drink whichever temperature you find easier to consume in larger quantities.
The three most effective times are: (1) 500ml immediately upon waking to rehydrate after 6–9 hours without fluid and suppress breakfast appetite; (2) 500ml 30 minutes before each meal to reduce calorie intake by ~13%; (3) whenever you feel hungry between meals, since thirst is frequently mistaken for hunger. Our daily hydration schedule includes these timing recommendations automatically.